Berberine dosage

Protocol

1. 1

   Measure the dose

   Typical Berberine dose is 1500 mg (500 mg three times daily with meals is the standard protocol; dihydroberberine is dosed at 100 to 200 mg three times daily). Use a weight-based calculator for individual adjustments.

   Open tool →
2. 2

   Set the frequency

   Administer 3x daily with meals. Half-life of 3 hours anchors the dosing interval.

   Open tool →
3. 3

   Cycle if needed

   No cycling required; some users pulse around high-carbohydrate periods

   Open tool →
4. 4

   Monitor for side effects

   Watch for: constipation; diarrhea; abdominal cramping; flatulence. Stop or reduce dose if tolerability breaks down.

Why this dose

Activates AMP-activated protein kinase (AMPK), suppressing hepatic gluconeogenesis and lipogenesis while increasing peripheral glucose uptake. Inhibits PCSK9 transcription, modulates bile acid signaling, and shifts gut microbiome composition.

The typical dose (1500 mg) reflects 500 mg three times daily with meals is the standard protocol; dihydroberberine is dosed at 100 to 200 mg three times daily. Individual response varies with body weight, baseline status, concurrent training, and concurrent medications, so the labeled range is the starting point rather than the prescription.

How to administer

Berberine is administered via the oral route. Oral dosing is straightforward: take with water, with or without food unless specifically noted.

Onset of action runs around 2 hours after administration. Peak effect lands near 3 hours post-dose. Plan the administration window so that peak effect lines up with whatever outcome you are dosing for, whether that is training, sleep, or symptom coverage.

Half-life note: Plasma half-life ~2 to 4 hours; oral bioavailability under 1%; gut microbiome metabolizes a fraction to more-absorbable dihydroberberine

Cycling and tolerance

No cycling required; some users pulse around high-carbohydrate periods

Effects to expect at typical dose

• Lowers HbA1c by ~0.7% versus placebo at 1500 mg/day across 27-trial meta-analysis (Lan 2015)
• Roughly comparable to metformin on fasting glucose and HbA1c in small head-to-head RCTs (Yin 2008)
• Reduces LDL cholesterol 10-20% and triglycerides 15-25% via PCSK9 inhibition
• Activates AMPK, the cellular energy sensor that drives insulin-independent glucose uptake
• Oral bioavailability under 1%; dihydroberberine is the higher-absorption alternative at lower doses
• GI side effects affect 10-30% at 1500 mg/day; split dosing with meals reduces incidence

Side effects and interactions

Common side effects

• constipation
• diarrhea
• abdominal cramping
• flatulence
• nausea

Notable interactions

• insulin or sulfonylureas (major): additive hypoglycemia risk; dose adjustment may be required
• cyclosporine (major): raises cyclosporine levels through CYP3A4 and P-gp inhibition
• metformin (moderate): additive HbA1c reduction; additive GI side effects
• statins (simvastatin, atorvastatin) (moderate): CYP3A4 inhibition raises statin plasma levels
• calcium channel blockers (amlodipine) (moderate): elevated plasma levels via CYP3A4 inhibition

Lists above cover commonly reported and well-characterized items. They are not exhaustive: review the full Berberine profile and discuss with a clinician familiar with your medication list before starting, particularly if you are on prescription therapy or have a chronic condition.

Regulatory snapshot

WADA status

allowed

DEA / Rx

Not scheduled

Pregnancy

Contraindicated (kernicterus risk in neonates)

Legal status

Dietary supplement (US, EU, UK, Canada); Rx in some Asian jurisdictions

Do not use if

• pregnancy
• lactation
• neonatal jaundice
• severe liver disease

Related research